I was wanting to build a metal topped rail, and was wondering if you could take a 2X4 and on each side put a 2 in. by 2 in. Angle Iron. How well would a snowboard slide on Angle Iron if it was washed down, maybe waxed. Thanks!

Trying to picture what you are doing, but just so you know a 2x4 is actually 1.5"x3.5". Your two sets 2" angle iron would overlap if you trying to do what I think you are trying to do....I think I explained that right.

Countersink and screw it in. I use flat bar for the sides of my box. Angle irons aren't square through the bend so when you lay them on you have to screw them in from the top anyways. If you screw them in from the sides it'll push the tops up as it tightens.